Deuteronomy 9:17-21

17And I took the two tables, and cast them out of my two hands, and brake them before your eyes.

18And I fell down before Yhwh, as at the first, forty days and forty nights: I did neither eat bread, nor drink water, because of all your sins which ye sinned, in doing wickedly in the sight of Yhwh, to provoke him to anger.

19For I was afraid of the anger and hot displeasure, wherewith Yhwh was wroth against you to destroy you. But Yhwh hearkened unto me at that time also.

20And Yhwh was very angry with Aaron to have destroyed him: and I prayed for Aaron also the same time.

21And I took your sin, the calf which ye had made, and burnt it with fire, and stamped it, and ground it very small, even until it was as small as dust: and I cast the dust thereof into the brook that descended out of the mount.